Shift to development track containerd

Move to the development track of `containerd` not the legacy 0.2
branch. The commands have changed a bit.

This does increase the image size as we are bundling the Docker
copy and our copy, and the new one is larger as it is growing features.
Hopefully Docker will shrink eventually. Also we may replace `ctr`
with a library.

Fix #1029

Signed-off-by: Justin Cormack <justin.cormack@docker.com>

alpine/packages/test/etc/init.d/test

@@ -11,7 +11,7 @@ start()
 
 	ebegin "Running tests"
 
-	if containerd-ctr containers start --no-pivot --attach test /test
+	if ctr run --bundle /test test
 	then
 		printf "Moby test suite PASSED\n"
 	else